Statistics: center and spread

High School Math 1 · Unit 17 · descriptive-stats-spread

descriptive-stats-spread

Name ______________________________Date ______________

1.
Find the mean of $4,\ 7,\ 7,\ 10,\ 12$ .
Answer: ______________
2.
Find the population standard deviation $\sigma$ of $5,\ 7,\ 8,\ 9,\ 11$ .
Answer: ______________
3.
Eight runners' times, in minutes: $14,\ 15,\ 16,\ 18,\ 20,\ 21,\ 22,\ 40$ . Using the $1.5 \times IQR$ rule, what is the upper fence (the value above which a time counts as an outlier)?
Answer: ______________
4.
Six quiz scores are $7,\ 9,\ 9,\ 10,\ 12,\ 13$ . Their mean is $10$ . What is the population standard deviation $\sigma$ ?
1. (A)
  $2$
2. (B)
  $4$
3. (C)
  $\sqrt{24}$
4. (D)
  $24$
5.
A data set has mean $40$ and standard deviation $5$ . Every value in the set is doubled. What are the mean and standard deviation of the new data set?
1. (A)
  mean $80$ , standard deviation $5$
2. (B)
  mean $40$ , standard deviation $10$
3. (C)
  mean $80$ , standard deviation $20$
4. (D)
  mean $80$ , standard deviation $10$